🚀 go-pugleaf

>>>>> "PvdS" == Patrick van der Smagt <smagt@fwi.uva.nl> writes:

PvdS> Big question mark.  If one compiles a C program with option
PvdS> -Wall, gcc complains about implicit declaration of printf &c.
PvdS> That makes sense, since printf is never declared in, e.g.,
PvdS> stdio.h.  There must be a reason for this??

PvdS> Any explanations will be tremendously appreciated.


There are two variations on having an ANSI C compiler: a hosted
implementation and an unhosted implementation.  gcc falls into the
latter category.

A hosted ANSI C system includes all the headers and the C library as
defined by most good ANSI C books.

An unhosted ANSI C compiler is just that: a compiler.  There is no
mention of headers or a library.  It is up to you (or your system
vendor) to provide the proper ANSI headers and libraries.  You can't
expect the headers to be ANSI compliant or to have proper prototypes,
nor can you expect the C library to contain all the ANSI C library
functions.
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Vivek Khera, Gradual Student/Systems Guy  Department of Computer Science
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